1
Q
slope formula
A
(y2−y1) / (x2−x1)
2
Q
slope-intercept form
A
y = mx + b
3
Q
midpoint formula
A
[ (x1 + x2) / 2, (y1 + y2) / 2 ]
4
Q
mean/average
A
sum of the terms / the number of different terms
5
Q
average speed
A
total distance / total time
6
Q
probability of an outcome
A
number of desired outcomes / total number of possible outcomes
7
Q
probability of two independent outcomes both happening
A
probability of event A • probability of event B
8
Q
find x percent of a given number (n)
A
n(x/100)
9
Q
find what percent a number (n) is of another number (m)
A
(100n)/m
10
Q
find out what percent a number (n) is x percent of
A
(100n)/x
ACT math
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